Improvement in filters



ALFRED II'OLLINGS, OF PROVIDENCE, RHODE ISLAND.

EPIFROVEMENT iN FILTERS.

Speciliration forming part oi'Letfers Patent No. E lly, dated March 17,i874; application filed August 1S, 1573.

To all whom 'it may conce-w17.'

De it known that I, ALFRED HOLLINGS, of the city and county ofProvidence, State ot Rhode Island, have invented an Improved Filter, ofwhich the following is aspecifica-tion:

rIhe object ot` my invention is to construct a cheap, quick, andefticient tilter for filtering large quantities ot magma, or mixtureobtained in chemically treating the waste-water ot' woolen, worsted, orother manutactories, in order to utilize the oil or fatty mattercontained therein.

In the accompanying drawing, like letters indicate like parts.

Figure l is an elevation of my invention. Fig. 2 is a ground plan of thesame.

In the drawing', A A represent a box or cistern, of any required sizeand depth, in the bottom ot' which I make suitable holes to let out thewater. This cistern is best made of wood 5' but where the ground is hardand rm, it might be constructed by simply excavating a trench ot therequired size in the ground, providing proper drains in the bottom forthe escape of the water. Into this cistern I place a coil of steam-pipe,B B, provided with a valve or inlet for steam at C, and valve or outletfor condensed water at D. Over this coil et" pipe I put in a thick layerof small stones or pebbles, E, over which I place a thin layer ofsawdust, F, on the top ot' which I place the magma or mixture requiringiiltering. The heat from the steam assists the rapid escape of thewater, especially in cold weather, being then absolutely necessary,while the sawdust eii'ectually prevents the smallest particle of magmabeing wasted. A small quantity et' the sawdust is unavoidably removedwith the magma at each removal; but this assists at the next process towhich the magma is subjected.

I am aware that filters are in use for chemical purposes; but these aregenerally made of cocoa or hair matting, canvas, or linen, and which,from the nature ot the materials employed, are very expensive, slowfilters, as well as inconvenient for the removal of the magma.

What I claim as my invention, and desire to secure by Letters Patent,is-

The construction of aiilter heated by steam, with lining of stones andsawdust, in the man.- ner substantially as described, as and for thepurpose specified.

ALFR ED HOLLING S.

Witnesses J. F. VrcKs, RICHARD DRIVER.

